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#!/usr/bin/env python
"""\
Just some work for generating a changeset.
"""
import bzrlib, bzrlib.errors
def _canonicalize_revision(branch, revision=None):
"""Turn some sort of revision information into a single
set of from-to revision ids.
A revision id can be none if there is no associated revison.
"""
# This is a little clumsy because revision parsing may return
# a single entry, or a list
if revision is None:
old, new = None, None
elif isinstance(revision, (list, tuple)):
if len(revision) == 0:
old, new = None, None
elif len(revision) == 1:
old = revision[0]
new = None
elif len(revision) == 2:
old = revision[0]
new = revision[1]
else:
raise bzrlib.errors.BzrCommandError('revision can be'
' at most 2 entries.')
else:
old = revision
new = None
if new is not None:
new = branch.lookup_revision(new)
if old is None:
# Get the ancestor previous version
rev = branch.get_revision(new)
old = rev.precursor
else:
old = branch.lookup_revision(old)
else:
if old is None:
old = branch.last_patch()
else:
old = branch.lookup_revision(old)
return old, new
def _get_trees(branch, revisions):
"""Get the old and new trees based on revision.
"""
if revisions[0] is None:
old_tree = branch.basis_tree()
else:
old_tree = branch.revision_tree(revisions[0])
if revisions[1] is None:
new_tree = branch.working_tree()
else:
new_tree = branch.revision_tree(revisions[1])
return old_tree, new_tree
def _fake_working_revision(branch):
"""Fake a Revision object for the working tree."""
from bzrlib.revision import Revision
import time
from bzrlib.osutils import local_time_offset, \
username
precursor = branch.last_patch()
precursor_sha1 = branch.get_revision_sha1(precursor)
return Revision(timestamp=time.time(),
timezone=local_time_offset(),
committer=username(),
precursor=precursor,
precursor_sha1=precursor_sha1)
class MetaInfoHeader(object):
"""Maintain all of the header information about this
changeset.
"""
def __init__(self, branch, revisions, delta):
self.branch = branch
self.delta = delta
self._get_revision_list(revisions)
self._get_all_meta_info()
def _get_revision_list(self, revisions):
"""This generates the list of all revisions from->to.
"""
old_revno = None
new_revno = None
rh = self.branch.revision_history()
for revno, rev in enumerate(rh):
if rev == revisions[0]:
old_revno = revno
if rev == revisions[1]:
new_revno = revno
if old_revno is None:
raise bzrlib.errors.BzrError('Could not find revision for %s' % revisions[0])
if new_revno is not None:
for rev_id in rh[old_revno:new_revno+1]:
self.revision_list.append(self.branch.get_revision(rev_id))
else:
for rev_id in rh[old_revno:]:
self.revision_list.append(self.branch.get_revision(rev_id))
self.revision_list.append(_fake_working_revision(self.branch))
def write_meta_info(self, to_file):
"""Write out the meta-info portion to the supplied file."""
from bzrlib.osutils import username
def write(key, value):
to_file.write('# ' + key + ': ' + value + '\n')
write('committer', username())
def show_changeset(branch, revision=None, specific_files=None,
external_diff_options=None, to_file=None):
from bzrlib.diff import compare_trees
if to_file is None:
import sys
to_file = sys.stdout
revisions = _canonicalize_revision(branch, revision)
print "Canonicalized revisions: %s" % (revisions,)
old_tree, new_tree = _get_trees(branch, revisions)
delta = compare_trees(old_tree, new_tree, want_unchanged=False,
specific_files=specific_files)
meta = MetaInfoHeader(branch, revisions, delta)
meta.write_meta_info(to_file)
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